What is the difference between Collision domain and Broadcast domain

Collision domain is an area of network  where all devices or packets can colloid to each other and have collision  , collision occur if two or more device shared the same LAN segment.you can avoid collision if you can have devices that capable of avoid collisions like switches and bridges .

Broadcast domain is an area of network where all devices or packets can send data to each other and use the FF:FF:FF:FF:FF:FF mac address . Example : DHCP packets can not know the destination address or device address so it can always broadcast to FF:FF:FF:FF:FF:FF address.